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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received July 5, 2002
Accepted August 29, 2002

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Hydrothermal Synthesis of La-Mn-hexaaluminates for the Catalytic Combustion of Methane

Jinguang Xu Zhijian Tian^† Junwei Wang Yunpeng Xu Zhusheng Xu Liwu Lin

Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China

tianz@dicp.ac.cn

Korean Journal of Chemical Engineering, March 2003, 20(2), 217-221(5), 10.1007/BF02697231

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Abstract

Hydrothermal synthesis by using urea hydrolysis at 1.0-3.0MPa and 120-130 ℃ was employed to prepare Mn-substituted hexaaluminate catalysts for methane combustion. The results from DTA-MS demonstrated that CO3(2-) and OH(-) anions co-exist in the hydrothermal reaction. XRD reveals that the components of carbonates and hydroxides in the hydrothermal reaction are more favorable than those in the (NH4)2CO3 co-precipitation for the formation of the Mn-substituted hexaaluminate phase. After calcination at 1,200 ℃ for 2 h, LaMnAl11O19 is the major phase of the catalyst prepared by the hydrothermal synthesis method while LaAlO3 is the major one of the catalysts prepared by NH4OH and (NH4)2CO3 co-precipitation. The catalyst prepared by hydrothermal synthesis has higher activity than that prepared by NH4OH and (NH4)2CO3 co-precipitation. The major reason is that more Mn(2+) ions have incorporated into the hexaaluminate lattice. The effect of drying methods on the formation of hexaaluminate phase was also discussed.

Keywords

Methane Catalytic Combustion Hydrothermal Synthesis Hexaaluminate Urea Hydrolysis

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